The circuit is the same as the V7 VHF FM transmitter, but with a few small additions. TR1 (BC547) is an inverted Hartley oscillator which is based on the inductor manufactured PCBs. This makes it stable and megga-setable throughout the VHF FM band (76MHz to 119MHz) and the BB105 varicap voltage is tuneable over about [...]
This is a well designed basic FM transmitter that you can easily recive the signals transmitted from this transmitter in a 1-2km range with using a normal FM reciever. Another property of this circuit is that the bobin is placed on the printed circuit board. The input sound’s amplitude can be adjusted by using the [...]
While there are a plethora of similar 2-transistor schematics available, this one is above average. A major improvement over the little 1-transistor circuit that we’ve discussed previously, this transmitter consist of two stages. The first transistor is used to amplify audio, which means that the microphone is now much more sensitive to sound. The second [...]
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